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Teachers unions funneled $2.5 million into what Gov. Cuomo called “front groups” to do their dirty work attacking him for supporting charter schools and opposing tax hikes.

The rebranded ACORN — New York Communities for Change — received a total of $1.3 million from the United Federation of Teachers and New York State United Teachers from 2010 to 2013. The unions also pumped $1.2 million into a group called Alliance for Quality Education.

Both issued statements accusing the governor of “pay-to-play politics” for backing charter schools because of campaign contributions he received from charter-supporting “Wall Street billionaires.” They also supported tax hikes on the rich opposed by Cuomo.

The labor leaders defended the spending.

Said UFT president Mike Mulgrew, “We are proud of the work we do with groups that give voice to the voiceless.”

“We stand up for public schools,” said AQE Director Billy Easton. “AQE wants to provide every child the right to a quality education.”

NYSUT spokesman Carl Korn said, “The Alliance for Quality Education is a staunch ally of the union in supporting public schools.”

Cuomo blamed the attacks on “a big bureaucracy with a system that is entrenched.”